# Check if all macros were replaced.
	#
	# Return false if a macro was not replaced and store message in `warnings`.
	#
	#     var tpl = new TemplateString("Hello %FIRSTNAME%, %LASTNAME%!")
	#     assert not tpl.check
	#     tpl.replace("FIRSTNAME", "Corben")
	#     tpl.replace("LASTNAME", "Dallas")
	#     assert tpl.check
	fun check: Bool do
		warnings.clear
		var all_ok = true
		for name, macros in self.macros do
			for macro in macros do
				if not macro.is_replaced then
					all_ok = false
					warnings.add "No replacement for macro %{macro.name}% at {macro.location}"
				end
			end
		end
		return all_ok
	end